我正在尝试编写一个允许用户设置新配置文件图像的功能，新图像将被上传，旧图像将从firebase存储中删除。
我有两个功能可以执行此操作并且它们可以单独工作，但是如果我在删除功能之后运行上传，则新图像将无法上传，即使我在控制台中收到成功消息，也不会在存储中显示任何内容。理想情况下，我想首先删除并设置新图像，我尝试过多种方式;完成处理程序，添加延迟但没有任何工作。我现在甚至有两个按钮，一个控制每个功能来测试这个，但这仍然无法正常工作。我错过了什么？任何帮助都会很棒，因为我花了几个小时用这个绞尽脑汁！
Here is my complete code for the VC:
//
// LandingVC.swift
// Login
//
// Created by George Woolley on 07/11/2017.
// Copyright © 2017 George Woolley. All rights reserved.
//
import UIKit
import FBSDKLoginKit
import SwiftKeychainWrapper
import Firebase
class MyAccountVC: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
@IBOutlet weak var profilePictureImg: UIImageView!
@IBOutlet weak var usernameField: UILabel!
@IBOutlet weak var saveButton: UIButton!
@IBOutlet weak var changeProfilePicButton: UIButton!
let picker = UIImagePickerController()
let myUID = KeychainWrapper.standard.string(forKey: "uid")
override func viewDidLoad() {
super.viewDidLoad()
picker.delegate = self
if myUID == nil {
print("You are not logged in")
} else {
let ref = DataService.ds.DBCurrentUser
ref.child("MyDetails").observe(.value, with: { (snapshot) in
if let snapshots = snapshot.children.allObjects as? [DataSnapshot] {
for snap in snapshots {
if snap.key == "username" {
self.usernameField.text = snap.value as? String
}
if snap.key == "profileImageURL" {
if let url = snap.value as? String {
let ref = Storage.storage().reference(forURL: url)
ref.getData(maxSize: 2 * 1024 * 1024, completion: { (data, error) in
if error != nil {
print("An error has occured downloading image")
} else {
print("Image downloaded")
if let imageData = data {
if let img = UIImage(data: imageData) {
self.profilePictureImg.image = img
}
}
}
})
}
}
}
}
})
}
}
func removeImgFromFirebaseStorage() {
let ref = DataService.ds.DBCurrentUser.child("MyDetails")
ref.observe(.value) { (snapshot) in
if let snapshots = snapshot.children.allObjects as? [DataSnapshot] {
for snap in snapshots {
if snap.key == "profileImageURL" {
if let url = snap.value as? String {
let img = Storage.storage().reference(forURL: url)
img.delete(completion: { (error) in
if error != nil {
print("Error is \(String(describing: error))")
} else {
print("Success")
}
})
}
}
}
}
}
saveButton.isHidden = false
changeProfilePicButton.isHidden = true
}
func uploadImageToFirebase() {
if let imageToUpload = profilePictureImg.image {
if let imageData = UIImageJPEGRepresentation(imageToUpload, 0.2) {
let metaData = StorageMetadata()
metaData.contentType = "image/jpeg"
let imageUID = UUID().uuidString
DataService.ds.StorageProfile.child(imageUID).putData(imageData, metadata: metaData, completion: { (metadata, error) in
if error != nil {
print("Error occured uploading profile image")
} else {
print("Sucess")
if let downloadURL = metadata?.downloadURL()?.absoluteString {
DataService.ds.DBCurrentUser.child("MyDetails").child("profileImageURL").setValue(downloadURL)
}
}
})
}
}
saveButton.isHidden = true
changeProfilePicButton.isHidden = false
}
@IBAction func saveButonPressed(_ sender: Any) {
uploadImageToFirebase()
}
@IBAction func changeProfilePicturePressed(_ sender: Any) {
picker.allowsEditing = true
picker.sourceType = .photoLibrary
picker.mediaTypes = UIImagePickerController.availableMediaTypes(for: .photoLibrary)!
present(picker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage
profilePictureImg.contentMode = .scaleAspectFill
profilePictureImg.image = chosenImage
dismiss(animated: true, completion: removeImgFromFirebaseStorage)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
dismiss(animated: true, completion: nil)
}
@IBAction func logOffPressed(_ sender: Any) {
KeychainWrapper.standard.removeObject(forKey: "uid")
performSegue(withIdentifier: "loginVC", sender: nil)
let fbLogin = FBSDKLoginManager()
fbLogin.logOut()
try! Auth.auth().signOut()
}
}